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kubectl: Command-Line Kubernetes in a Nutshell

You're reading from   kubectl: Command-Line Kubernetes in a Nutshell Deploy, manage, and debug container workloads using the Kubernetes CLI

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Product type Paperback
Published in Nov 2020
Publisher Packt
ISBN-13 9781800561878
Length 136 pages
Edition 1st Edition
Concepts
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Author (1):
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Rimantas Mocevicius Rimantas Mocevicius
Author Profile Icon Rimantas Mocevicius
Rimantas Mocevicius
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Table of Contents (16) Chapters Close

Preface 1. Section 1: Getting Started with kubectl
2. Chapter 1: Introducing and Installing kubectl FREE CHAPTER 3. Section 2: Kubernetes Cluster and Node Management
4. Chapter 2: Getting Information about a Cluster 5. Chapter 3: Working with Nodes 6. Section 3: Application Management
7. Chapter 4: Creating and Deploying Applications 8. Chapter 5: Updating and Deleting Applications 9. Chapter 6: Debugging an Application 10. Section 4: Extending kubectl
11. Chapter 7: Working with kubectl Plugins 12. Chapter 8: Introducing Kustomize for Kubernetes 13. Chapter 9: Introducing Helm for Kubernetes 14. Chapter 10: kubectl Best Practices and Docker Commands 15. Other Books You May Enjoy

Describing nodes

The kubectl describe command allows us to get the state, metadata, and events of an object in a Kubernetes cluster. In this section, we will use it to describe the node.

We have got a list of nodes, so let's check out one of them:

  1. To describe a node, run the following command:
    $ kubectl describe node gke-kubectl-lab-default-pool-b3c7050d-6s1l

    As the command's output is quite big, we are going to show only some parts of it. You can check out the full output yourself.

  2. In the following screenshot, we see the assigned Labels (which can be used to organize and select subsets of objects) and Annotations (extra information about the node is stored there) for the node, and Unschedulable: false means that the node accepts pods to be scheduled on to it. For example, Labels can be used for Node Affinity (which allows us to constrain which nodes the pod is eligible to be scheduled on, based on the labels on the node) to schedule pods on particular nodes...
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